31 Year NEET Previous Questions: Thermodynamics - 2 Free MCQ Practice Test
MCQ Practice Test & Solutions: 31 Year NEET Previous Year Questions: Thermodynamics - 2 (30 Questions)
You can prepare effectively for NEET Physics Class 11 with this dedicated MCQ Practice Test (available with solutions) on the important topic of "31 Year NEET Previous Year Questions: Thermodynamics - 2". These 30 questions have been designed by the experts with the latest curriculum of NEET 2026, to help you master the concept.
Test Highlights:
- - Format: Multiple Choice Questions (MCQ)
- - Duration: 60 minutes
- - Number of Questions: 30
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First law of thermodynamics is consequence of conservation of [1988]
Detailed Solution: Question 1
At 27° Ca gas is compressed suddenly such that its pressure becomes (1/8) of original pressure. Final temperature will be (γ = 5/3)
Detailed Solution: Question 2
A thermodynamic process is shown in the figure.
The pressures and volumes corresponding to some points in the figure are
PA = 3 × 104 Pa
VA = 2 × 10-3 m3
PB = 8 × 104 Pa
VD = 5 × 10–3 m3.
In process AB, 600 J of heat is added to the system and in process BC, 200 J of heat is added to the system. The change in internal energy of the system in process AC would be [1991]
The pressures and volumes corresponding to some points in the figure are
VA = 2 × 10-3 m3
PB = 8 × 104 Pa
VD = 5 × 10–3 m3.
In process AB, 600 J of heat is added to the system and in process BC, 200 J of heat is added to the system. The change in internal energy of the system in process AC would be [1991]
Detailed Solution: Question 3
For hydrogen gas, Cp – Cv = a and for oxygen gas, Cp – Cv = b, so the relation between a and b is given by [1991]
Detailed Solution: Question 4
If for a gas, 
, the gas is made up of molecules which are [1992]
, the gas is made up of molecules which are [1992]Detailed Solution: Question 5
hence gas is monoatomic.A thermodynamic system is taken from state A to B along ACB and is brought back to A along BDA as shown in the PV diagram. The net work done during the complete cycle is given by the area[1992]
Detailed Solution: Question 6
An ideal gas A and a real gas B have their volumes increased from V to 2V under isothermal conditions. The increase in internal energy [1993]
Detailed Solution: Question 7
110 joules of heat is added to a gaseous system, whose internal energy is 40J; then the amount of external work done is [1993]
Detailed Solution: Question 8
Which of the following is not thermodynamical function ? [1993]
Detailed Solution: Question 9
An ideal carnot engine, whose efficiency is 40% receives heat at 500 K. If its efficiency is 50%, then the intake temperature for the same exhaust temperature is [1995]
Detailed Solution: Question 10
An ideal gas undergoing adiabatic change has the following pressure-temperature relationship [1996]
Detailed Solution: Question 11
....(2)
constantA diatomic gas initially at 18ºC is compressed adiabatically to one eighth of its original volume.The temperature after compression will be [1996]
Detailed Solution: Question 12
A sample of gas expands from volume V1 to V2.The amount of work done by the gas is greatest, when the expansion is [1997]
Detailed Solution: Question 13
The efficiency of a Carn ot engine operating between the temperatures of 100ºC and –23ºC will be
[1997]
[1997]
Detailed Solution: Question 14
If the ratio of specific heat of a gas at constant pressure to that at constant volume is γ, the change in internal energy of a mass of gas, when the volume changes from V to 2V at constant pressure P, is [1998]
Detailed Solution: Question 15
We consider a thermodynamic system. If ΔU represents the increase in its internal energy and W the work done by the system, which of the following statements is true? [1998]
Detailed Solution: Question 16
An ideal gas at 27ºC is compressed adiabatically to 
of its original volume. The rise in temperature is
[1999]
of its original volume. The rise in temperature is [1999]Detailed Solution: Question 17
A reversible engine converts one-sixth of the heat input into work. When the temperature of the sink is reduced by 62ºC, the efficiency of the engine is doubled. The temperatures of the source and sink are [2000]
Detailed Solution: Question 18
which increases to 
when the sinktemperature reduces by 62º C.
when T2 = sink temperature T1 = source temperature
If γ be the ratio of specific heats of a perfect gas, the number of degrees of freedom of a molecule of the gas is [2000]
Detailed Solution: Question 19
The temperature of source and sink of a heat engine are 127ºC and 27ºC respectively. An inventor claims its efficiency to be 26%, then:
Detailed Solution: Question 20
A gas at 27ºC temperature and 30 atmospheric pressure is allowed to expand to the atmospheric pressure. If the volume becomes 10 times its initial volume, then the final temperature becomes
Detailed Solution: Question 21
A Carnot engine whose efficiency is 50% has an exhaust temperature of 500 K. If the efficiency is to be 60% with the same intake temperature, the exhaust temperature must be (in K) [2002]
Detailed Solution: Question 22
An ideal gas heat engine operates in a Carnot cycle between 227ºC and 127ºC. It absorbs 6 kcal at the higher temperature. The amount of heat (in kcal) converted into work is equal to
Detailed Solution: Question 23
One mole of an ideal gas at an initial temperature of T K does 6R joules of work adiabatically. If the ratio of specific heats of this gas at constant pressure and at constant volume is 5/3, the final temperature of gas will be [2004]
Detailed Solution: Question 24
Which of the following processes is reversible?[2005]
Detailed Solution: Question 25
An ideal gas heat engine oper ates in Car not cycle between 227°C and 127°C. It absorbs 6 × 104 cals of heat at higher temperature. Amount of heat converted to work is [2005]
Detailed Solution: Question 26
A Carnot engine whose sink is at 300 K has an efficiency of 40%. By how much should the temperature of source be increased so as to increase, its efficiency by 50% of original efficiency ? [2006]
Detailed Solution: Question 27
The molar specific heat at constant pressure of an ideal gas is (7/2) R. The ratio of specific heat at constant pressure to that at constant volume is
Detailed Solution: Question 28
An engine has an efficiency of 1/6. When the temperature of sink is reduced by 62°C, its efficiency is doubled. Temperature of the source is
Detailed Solution: Question 29
.......... (1)
If Q, E and W denote respectively the heat added, change in internal energy and the work done in a closed cyclic process, then: [2008]
Detailed Solution: Question 30
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